| 摘要 |
PCT No. PCT/GB90/00532 Sec. 371 Date Feb. 7, 1991 Sec. 102(e) Date Feb. 7, 1991 PCT Filed Apr. 6, 1990 PCT Pub. No. WO90/12235 PCT Pub. Date Oct. 18, 1990.A method of covering two or more joined pipes which are to be pulled through soil is described. The two coated pipes are bared of coating or order to join them. The bared region is covered with a first heat shrinkable sleeve, and then a second heat shrinkable sleeve is applied to overlap the first sleeve and extend beyond it in the direction of the leading edge of the joined pipes. A metal band is secured around the second sleeve at the leading edge.
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